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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7513ae3b538b68585618c1694abf63a6a8596201010f2e162982ea61a55ec0b' 
  AND token = 'RKw07cPO912LgPhQ6TI5LondGyHhpEcRXwa/HBwyaNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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