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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075e04a7c838efae545cb82f11140d9308b779c2c4558722e1a6efafee32ff37' 
  AND token = 'hvhOg2rxR48AF/AXWhYdoPQnPiCD+2/PWjs9NJXkU2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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