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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be52c184b4c2ff2bf7c1e29d9eac5b9babc2e28e1c5eec07721f115613a1871b' 
  AND token = 'b9Xc4aES7Fg90N8pkQx8MVQSPe3zky3hyqiAXVz7eXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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