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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17591a06c28e7507585ba2e1ce31a11c27017b76bae95bd122e6abf8e78b7a98' 
  AND token = 'j9PFODbsMhl+OTGiEshT17X0Gk1fL961sF3jMTMxH3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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