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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51dfb00a6a35dc44c1ddc37586feb820b20a1b0137072ff8ae85d82eca7ed795' 
  AND token = 'PeOz7kbYoVHfAD+uizaRIJt2RzXi9VDDbIMuLHpFbmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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