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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2800717f1dd15b49837cea01cab4eca48b0a89c059b22885d8ad5976670ab9' 
  AND token = '7MVMnsb/HrG3CZ99QG0tHxTGwPIa3zOpiW1IvUP0NjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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