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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8073be0f3e108c4a6a817262ddfb4d34285f567077862b126de76577aec426' 
  AND token = '6umtBjFOLRqxEWWva6wzEtfcAslAig4ZibqrUaZtu3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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