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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db521a5c691e87e79e696f5427e9719785ff5a288ab337a9261b8894ddbc9c7' 
  AND token = 'spmUUBH0j9nilUACYybuCcSQ2EXM1XzInNWM+0wflm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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