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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adfb5ce04a486910693c3c810f04d06dd803fc4b3f3653186e60caf30ef3ff4' 
  AND token = 'MzUPdwUnNQckygwgwvDuEy4hn+r200u09KJi9pp+Pas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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