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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99925da67cb3b28a1db9f8f9076e44a608223f7dacd9e10ae83fb776897ebde' 
  AND token = 'gk+Fl3LW3yyeWSKVDMt/Oe4UjL16bkUD84XPr6dC9uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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