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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa5857348a5959ab2875e8bebe90346c3a747946e7eb145ad9be9fd5402c333' 
  AND token = 'hmn1sN/blvxrmVQfQIB7pwalOB0cfMslbomWXXkbLcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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