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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3903cc3a7ce59dee8a90b081e239026b0e89c725f4acc4a52814c3ac2c2b8560' 
  AND token = 'ADPlyxSNJ9GxaKodEmN6cJl2+zyeMvB2dwjQ9++7yyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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