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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb26554407149da7b42d7d0781757c90f0591a091c68809b02bf64f7e7e49f5' 
  AND token = 'fWL1Zp5G+9zOwO6QD5wd7I2xeasJ8Pl90NtjJsQB2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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