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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2a176fa8c098cbbbf44378e1665bf5ec9acadf0e634451b9cd0aed8f2674ff' 
  AND token = 'nl7yip7QXiv2vm19XLLmiOxVEOJh0pi+U78MVxRLcUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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