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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4320eca82d0b07b0aafe9de2ac01806871432abfbfc31d6aff3d86ba9f578bb4' 
  AND token = 'CLovQh8InmMbaJqEXabVZp6fFXfw6caHzEEPjjfwZ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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