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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948c1e79caaba20edade0d4e6ac98d5dd3428ea661308454734c50dc62e8ff9d' 
  AND token = '4nnCfXEb1YXglztvm0k6LaWROoeqTbH1UU16yjDGGMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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