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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117e55c98664cc56a7e35fd5d80ac34477c492442d07e4a18c4fb16a57fa1a6e' 
  AND token = 'cNLXvjxBUVk33siK910Tfnhl/m25kiLVXkbSb/ViWPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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