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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba955fa53610bf80f15f0a7599118ed0f5c31cb376ddadb1c5bf776c2a2c1b88' 
  AND token = '0Kqv6XtnNeIdgX/kytt08V/1zNrQVVFrzV8lamjAElY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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