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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fb5aa65dd89e94280a45475d3b02c3345df57e8a77cb887e72cd972240b5d0' 
  AND token = 'W5sW9UGdJQMbH0YNGIOszXc1Qs+/Ga7GdoChpTeYZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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