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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be021045e40eabe6d8f5a648a4feefefa891e8fd54a31bfe87ab7ee8366aea7f' 
  AND token = '4cCORYhtc4l+iPwoJi7BIofHSi0jGoDFyfxET3d2/co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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