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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb81852fae3ee00a95bd546e17781ee13db515bc40fa22b57d20763714a9559' 
  AND token = 'lkJjs1BRmvt29Z6y18ocBPh19F6ym8DBxRGQdE/sEYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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