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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e3fb490c17d733a5de8eaaff7b4265760a41c97f1ca15c58934d4627ead036' 
  AND token = '1Q9f0+M04WjwSEcR2v58mYbCAN+dnrlm8xndw03SbuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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