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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76ccdeeca2c3517738c54b10120c2d8074c32777c5d20dd4b1a1aa05daf1762' 
  AND token = 'wqFhfp3WBk6qXGa3uLdvGkObgNotPfzzSPB6cYjAmH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}