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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dc625fcc53935336d84d0772f6e470c31a342a681a310c02ee40fb4575d78a' 
  AND token = 'o9ePlNKRiWx2pnP48OXBp1GKYt/tHg9LsAv4cgJSkz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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