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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb82eb4eaf56596463c49d25f4e1fa454214d41ece86a8a369e0fb6a1a684af2' 
  AND token = 'Q1zZ1AkuFXf1ZzUC01SRe8XFQo0Eok5Eh79U4ey743c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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