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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7f09464ac3427353d757d46fc9dc85dd698f4d00c9771e1c5a20a1062d4ef8' 
  AND token = 'gmXhWqb9FJN1v7CmaX7T3otbZC830+s9h9mrlHnWr3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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