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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb739fed6e8650923ea69d868d5564258f5c01fc79412cdc06f0fcac555b481' 
  AND token = 'mVQvfI32qw0QXAMw6MoIuOP6jaH56bLLaRRHkeROdgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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