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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9b5772c5f723eb20d957621f15ea5f2e962ec0fcccaacb78b5eb772d4e7210' 
  AND token = 'ozjfLhxwaeScaWdxf8w6kRj9HeOc2kgX+6oQkLWeN7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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