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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27f6a40438ccedf90ac4b37d3cc2a86a83755554899b8fb26f4d4307f99c5e0' 
  AND token = '2gwDAAQQffj7d6IclkGng/JzmKR8aTUdVPy91+2+V6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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