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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bac3916814b9c0a5db9fd857ea77fb50e7d9b54a93036ee66e0b7fa815529b7' 
  AND token = 'P5YLwH52a6h4t8BbplTlfBt+bP34V+NGPUOl+2iyKs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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