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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becac465b7881e5482367b4d679396c822b1b6278269e4ea240bc93aa03f34a8' 
  AND token = 'Mz8g+NXGeHI93rgyhY5oDn2nqfGcwdidlccZHcEuxZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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