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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f37687a0893b2cb97dda2a2ed03d6931c125b2ded9ea30591f6a2fc673174a8' 
  AND token = 'nYWzTc4n45AhiPvI4l4Ln0CKuGfeSIMrCZwPHVa8dtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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