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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f48b04a7467745306c2d7e299564b193a5e6d6cf0f084a912de40abd5d4671' 
  AND token = 'k9/V5eKQqOQcP5BoVAbbVsWSr7pu1xPkDzY6GXbJgpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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