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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57cc7231b0f1213e00d4d9cfc0a82625da40c502340a06f726128ee67891c0a' 
  AND token = 'tYARQrfxTq+ZSQi68IvYL2N8HlAN1etZNWgYgOEKozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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