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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e76d53d502dc4ba1a3c03934b4c78706c3becc0bc56e146cd4b3a0fc040bace' 
  AND token = 'A0v5BPpXoYoPxnAUtwceFFXNIl1IRZQjF5aA4ZZVjQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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