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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab8bdbfbc09c1095d8ef67d8b3514b083dd334e428d1f0445ccf58600f0c0ad' 
  AND token = 'cH3Txvd55I3hIw5du1rMRxNGroPoSXIvdY7ATdzvVDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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