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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db96706654734da4d90fb98e15aad547d01bb52f3c23553a5ee7f64ff362a49e' 
  AND token = 'aeKMWTSfFiI4+2xaQ/74AZZdFPD3BF/rQ8rRGI75ytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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