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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eac42144fb3de30214cabc79036ed2150e8e88ce37c8a1d7380368fa33ec8f7' 
  AND token = 'qFYjTgKARGrE70fF8I1mR6cAkZsoUqPbgB0KSC/kSQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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