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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55461017affe84ebec8dcbd99f7f8f4acc019a3875022294687dd98085ac91c4' 
  AND token = 'dXAYIXcjdC2eS1nOXrlGbBCSzCex9JtBO4gFGF25MiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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