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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840f869fa8423a719b9a9ed927eabb56501e49d479a86bde019fb6a53f599742' 
  AND token = '6L515sqcl5OgP+S41YUwtdCS3t3O7b+saEen0JOAPYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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