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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e9a6dc937c9fd0f93eed81484959858b622ffb8519f6890360da046f4a16c' 
  AND token = 'OGsj8Uc/Wrw01t8ff7aR5re346Oaxw21ZsriEV8NNQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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