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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae5825813ca1dd8cc55ba5db267e90129f8ca0697d7fb5f9448b9641fb002f8' 
  AND token = 'NMIQsgIZr6LK24affYsqLKaoJkPmgDNWgrBEvr06/s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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