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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a88d4f8f7130de523693f7515c3b6ecdd050507fe24a25280cd1ea86654d8b' 
  AND token = 'HtAzwX0QxISMD/LQ1fJEETK7NjN4vm05K/drF+ZuNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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