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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c84b3384e250e88a7e72551b7378f151f578b02a894d8a925141b0739837e0' 
  AND token = 'nFGkLpKlhAIXbl9gRcrBv7qXh4/UT50lLt6DFLvpc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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