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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c990f4b907563a146f6c1649fe72b83f75e715886552e8831ab24a790a53f130' 
  AND token = 'gYlu4t8a16jHuK97eEvmDZ1t41xG5bcyM2cnmg4bCZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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