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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ccf231baf033d2ba68b96ee16fc99880ff8a89e55725bae3631706ef26995a' 
  AND token = '5/eltLC0CPcuQ1wZykM1maciGiLuPZiGjapbJ+dGd0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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