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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dc7495686918b14dcfa825a02498026d637d26578ac8fc471f8fe5f5f390ea' 
  AND token = 'Ep3+2ZPt78+x9GNYfsVZJU673s6VaY+JilPfHUIEzkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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