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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586909e24bcf851dc995ddf523a6d3837bb5b58e77bae37927e738e1f40fee17' 
  AND token = '8lqPcgFaSNqeW+SQPuj2oXFCT9nO+GFHNK6KSRw+wt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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