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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5634c3678678b9c43ccc57774416eaab9e094d6e4f2785f0e4778f5d45c8aaee' 
  AND token = '2PhkizdZcrYrySwK+YmBfJNI1m+wILh6LHrDEZ5AUJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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