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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c97dcf9161408caaafe5a2a3e95ef7bec205bbb7b513a3e4aac0b3818ce3ace' 
  AND token = 'Wx4ktVTGEwDIaLFOZWLHcV5UY7EdmYQel5hO7CHGut4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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