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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea08161e43245fdcd4a23b7e7e2bdd10121542675d1b1b086c2f723195f66a0d' 
  AND token = '1vNCNVeldrHU8ETjPro7GD1wvFZR/DBFb/PM+EECzp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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