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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40476bcd6fb4698575d13b467b924cf556172d978f7c62f6685dfc12ca0b3e2' 
  AND token = 'kuWTHx/9dOBul2G/UKMJi3Veg+LebAumHbUmWx6b6zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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