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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6215c4ca32ad6feca1a4f18d61f0ff2c042ecfc64a9b6f8a656c809d4dafa2fc' 
  AND token = 'xfuqOl0AGc3RCnZXfLnxa6j9aw/3Q6gBGGFxgTq4Tl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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