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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfb2ff20a026881dc580087fcb4c43be4f7af79c8fa25d6bedbb1f8faa0a8fc' 
  AND token = 'p3n128ZUPETqVA07BdT1UFcglcIitamBXBvyYZ/ClEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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