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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df40a9f4f9a504d065c8ca971d2531b79bf3d9d01f3b049a679c72a5cecdc9c' 
  AND token = '7pB+Yrgnei4tCHlDWcAKUQDapBFHLpL/9k3SCPzSrH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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