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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849da1ea35f02a4d1604c9aa8b39b4b3241bcf7f5c2e046f675f9e0397595f0e' 
  AND token = '9/IttqusCAqrhW2rAsS1xkfTK2YVLx2Li9txZ/10ffQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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