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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffca10febe093c4ef92c7f49975b0dc043ac85bd52076b98b30c2078e6372e6' 
  AND token = 'f8KgKKUI4d7bc281ACWmCcmLl2RXWDQGi5JpcXTEy+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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