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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6963ecada081248699004bf77bbc013e312ecbf3c34f5a51a16308b93be8d2' 
  AND token = 'Rm7huCfwd1MgcAxSmVZoetd5eIS9JI+W30Sf8jix/FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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