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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc8d38b2181b6f605e6aa97656e85807577419447dc30508d1e6ee52bd46abd' 
  AND token = 'wd3JW9qj8810b6J6mUZYdGz3p3kCOUik3GCpgr0Sc5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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