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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af22fe8b47858b636d26d71b1d87ec3507a6ae2f67ce5a0de97a88495833ec9' 
  AND token = '8LaNoO05vjQZO6+yzCyDOnDcRuxZ+hOiT5qTj9ODAXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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